Abstract: [Problem] To provide a nozzle cap that hardly causes clogging in the nozzle hole even when used for a long time, a nozzle device having such a nozzle cap and a spraying method of a chemical solution.

Abstract: A two-fluid nozzle of an internal mixing type in which clogging does not occur easily, excellent atomization performance can be obtained, and various application can be realized with simple constitution is provided. A constitution is such that a liquid cap body having a fluid channel formed therein and into which a supply liquid is supplied from an upstream side and an air cap body provided on a downstream portion of the liquid cap body and into which a supply gas is supplied are provided, a liquid outlet is provided on a downstream end of the liquid cap body, a gas chamber portion into which the supply gas is supplied is formed inside the air cap body, a mixed gas outlet is formed on the downstream side of the gas chamber portion, and a mortar-shaped mixed-gas expanding portion is provided immediately after the mixed gas outlet.

Abstract: [Problem] To provide a nozzle cap that hardly causes clogging in the nozzle hole even when used for a long time, a nozzle device having such a nozzle cap and a spraying method of a chemical solution.